My 27inch imac (2010) wont boot ,

it gets to the apple logo and then to the next grey screen and stops there , but on one out of 100 boots it might boot as normal , its driving me crazy can anyone shed some light on this for me ....thanks
also if it does boot up as normal it might only go for a limited time and then freezes , i have done the hardware scan and it come up with no trouble found and also reset the pram about 100 times , tried to start in safe mode etc ..... done every combo of keys i can find referance to on the net and it still wont boot , exept randomly , also changed out the hard dive and the ram with known good units but nothing....... please if anone can help me before i go crazy that would be so cool.......... i also rang a local mac shop and the said that the logic board is stuffed and they will replace it for around $1000 ........ that is not an option.... and then the dude also said he will buy it from me for $300......... *** ...... maby he knows its an easy fix and is trying to screw me over....... anyone please help

You could have a failing hard drive. If you can, you need to backup all of your data.
Try and run Disc Utiity from your original discs or from your OS X 10.6 Snow Leopard install disc.
Try doing both permissions repair and hard drive repair.
If the drive reports any errors, then there is serious problem with the internal hard drive.
You could take a chance that it is not a logic board failing and purchase an external FireWire 800 hard drive and install a new version of OS X 10.6 Snow Leopard on the new drive, boot OS X from the new ext. drive and try to transfer/clone all of your data from your internal hard drive.
Find another Apple Store or another authorized Apple service center to bring your iMac.
When they do the diagnostics, If they find it's the Logic board, then you're out of luck!
You'll need to look for another computer.
If they find it's a failing internal hard drive, then you can have this drive replaced. The costs to replace the internal hard drive should not be too bad.

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Please can someone help.....
I got a Imac G4 at the weekend for a bargin, but it wont boot up. When i turn it on it makes the noise and comes up with a grey screen with the apple logo and the loading circle. It doesnt go past this screen and after about 15 mins turns itself off.
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My 27inch imac (2010) wont boot ,

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